jQuery.extend(DateInput.DEFAULT_OPTS, {
      month_names: ["Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"],
      short_month_names: ["Jan", "Feb", "Mär", "Apr", "Mai", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dez"],
      short_day_names: ["So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"],

      stringToDate: function(string) {
        var matches;
        if (matches = string.match(/^(\d{2,2}).(\d{2,2}).(\d{4,4})$/)) {
          return new Date(matches[3], matches[2] - 1, matches[1]);
        } else {
          return null;
        };
      },
      dateToString: function(date) {
        var month = (date.getMonth() + 1).toString();
        var dom = date.getDate().toString();
        if (month.length == 1) month = "0" + month;
        if (dom.length == 1) dom = "0" + dom;
        return dom + "." + month + "." + date.getFullYear() ;
      },

      show: function() {
              if($('#edit-start-day').val().length>4){
                this.selectedDate = this.stringToDate($('#edit-start-day').val());
                this.selectedDateString = this.dateToString(this.stringToDate($('#edit-start-day').val()));
                this.selectMonth(this.selectedDate);
              }
            this.rootLayers.css("display", "block");
            $([window, document.body]).click(this.hideIfClickOutside);
            this.input.unbind("focus", this.show);
            $(document.body).keydown(this.keydownHandler);
            this.setPosition();
          },
});;